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Search Results: 1 - 10 of 465603 matches for " Eleazar; Cabrera Pe?a "
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Crecimiento y ciclo reproductivo de Polymesoda radiata (Bivalvia:Corbiculidae) en Costa Rica
Ruiz Campos,Eleazar; Cabrera Pea,Jorge; Cruz,Rafael A.; Palacios,José A.;
Revista de Biología Tropical , 1998,
Abstract: a population of green clam, polymesoda radiata was sampled from august 1992 through july 1993 in bebedero river, guanacaste, costa rica (n= 978) for demographic data. mean values (followed by ranges) were: shell length 32.29 ±7.63 mm (6.9-44.10 mm). the mean total weight was 11.13 ±5.71 g (0.4-23.98 g). data analysis showed a isometric relationship between length and total weight, represented by the equation : pt=2.07 x 10-4 lt3.01 (r=0.987, p < 0.01). von bertalanffy's equations were: for length lt=45 [1 - e{-1(t+0.06) (05/2 ) sen 2 ((t-065}] and for weight pt= 26.53 (1- e [-1 (t + 0.06)])3 . the growth rate for total length was 2.25 ±0.66 mm/month for the first year (0.83 ±0.24 the second year and 0.26 ±0.1 for other months). individuals become sexually mature throughout the year. the mean sex ratio was 1.00 male : 0.61 females. spawning suggested that minimum size at sexual maturity was 7.80 mm of lt. the largest number of ripe individuals was found in the dry season. spawning peaks were in december and march. histologically this is a dioecious bivalve with stable gonocorism.
Composición bioquímica de la carne de Polymesoda radiata (Bivalvia: Corbiculidae), en Costa Rica
Ruiz Campos,Eleazar; Cabrera Pea,Jorge; Cruz,Rafael A.; Palacios,José A.;
Revista de Biología Tropical , 1998,
Abstract: monthly changes in biochemical composition and condition index of the green clam, polymesoda radiata were studied from august 1992 through july 1993 in bebedero river, guanacaste, costa rica. this species has a continuous spawning throughout the year with maximun periods in december and april (following values are % means and standard deviations). fresh meat was 12.53 ± 3.78 . dry flesh compositions: 78.29 ± 2.15 proteins; 9.52 ± 1.00 lipids; 5.78 ± 2.50 carbohydrates; and 6.43 ± 2.10 ashes. water 90.10 ± 2.14 (correlated with the spawning period). the condition index was 9.89 ± 2.14. dry flesh caloric value: 4.51 ± 0.11 kcal/g. the condition index, caloric value and carbohydrates decreased during the spawning period. lipids, proteins and ashes had not relationship with the spawning period. the mean condition index was inverse correlation with the spawning period.
Composición bioquímica de la carne de Polymesoda radiata (Bivalvia: Corbiculidae), en Costa Rica
Eleazar Ruiz Campos,Jorge Cabrera Pea,Rafael A. Cruz,José A. Palacios
Revista de Biología Tropical , 1998,
Abstract: Se determinó la composición bioquímica y el indice de condición de la almeja verde (Polymesoda inflata) en el río Bebedero, Guanacaste, Costa Rica, entre agosto de 1992 y julio de 1993. El peso promedio de carne fresca fue de 12.53 ± 3.78 % , con un valor promedio de humedad de 90.10 ± 2.14 % . El promedio de los componentes en base seca fue proteínas 78.29 ± 2.15, lípidos 9.52 ±1 %, carbohidratos 5.78 ± 2.5 % y cenizas 6.43 ± 2.1 %. El promedio del índice de condición para la población fue de 9.89 ± 2.14. El promedio del valor calórico fue 4.51 ± 0.11 Kcal/g . Se determinó que el índice de condición, valor calórico y carbohidratos decrecen con la época reproductiva. Los lípidos, proteínas y cenizas no tiene relación con el ciclo reproductivo. Monthly changes in biochemical composition and condition index of the green clam, Polymesoda radiata were studied from August 1992 through July 1993 in Bebedero river, Guanacaste, Costa Rica. This species has a continuous spawning throughout the year with maximun periods in December and April (following values are % means and standard deviations). Fresh meat was 12.53 ± 3.78 . Dry flesh compositions: 78.29 ± 2.15 proteins; 9.52 ± 1.00 lipids; 5.78 ± 2.50 carbohydrates; and 6.43 ± 2.10 ashes. Water 90.10 ± 2.14 (correlated with the spawning period). The condition index was 9.89 ± 2.14. Dry flesh caloric value: 4.51 ± 0.11 Kcal/g. The condition index, caloric value and carbohydrates decreased during the spawning period. Lipids, proteins and ashes had not relationship with the spawning period. The mean condition index was inverse correlation with the spawning period.
Crecimiento y ciclo reproductivo de Polymesoda radiata (Bivalvia:Corbiculidae) en Costa Rica
Eleazar Ruiz Campos,Jorge Cabrera Pea,Rafael A. Cruz,José A. Palacios
Revista de Biología Tropical , 1998,
Abstract: Se determinó el crecimiento, biometría, desarrollo gonádico, ciclo reproductivo y talla mínima reproductiva en Polymesoda radiata en el río Bebedero, Guanacaste Costa Rica, entre agosto 1992 y julio 1993. El promedio de la longitud total fue 32.29 ±7.63 mm (ámbito entre 6.90 to 44.10 mm). El peso total fue 11.13 ±5.71 g (ámbito entre 0.4 to 23.98 g). La relación Lt-Pt determinó que el crecimiento es de tipo isométrico y se rige por la ecuación Pt= 2.07 x 10-4 Lt3.01 (r=0.987, p 0.01). La ecuación generalizada de von Bertalanffy se rige para Lt por Lt= 45 [1 - e{-1(t+0.06) (05/2 ) sen 2 ((t-065}] y para peso total por Pt= 26.53 (1- e [-1 (t + 0.06)] )3. La tasa de crecimiento para Lt fue de 2.25 ±0.66 mm/mes para el primer a o, 0.83 ±0.24 mm/mes para el segundo a o y 0.26 ±0.1 mm/mes para el resto de los meses. Durante todo el a o se encontraron individuos en las diferentes etapas reproductivas. La proporción sexual para el periodo de estudio fue de 1.00 macho:0.61 hembras. La talla a la que se distinguen células sexuales tanto para machos como hembras fue de 6.62 mm y se establece como talla mínima reproductiva 7.80 mm, ya que a partir de ésta se observaron individuos desovados. La mayor actividad de desove se observó durante la época seca con dos picos máximos de desove al a o, uno en diciembre y el otro en marzo. El análisis histológico determinó que la especie es dioica con un bajo porcentaje de hermafroditismo en la población (2.15 %). A population of green clam, Polymesoda radiata was sampled from August 1992 through July 1993 in Bebedero river, Guanacaste, Costa Rica (n= 978) for demographic data. Mean values (followed by ranges) were: shell length 32.29 ±7.63 mm (6.9-44.10 mm). The mean total weight was 11.13 ±5.71 g (0.4-23.98 g). Data analysis showed a isometric relationship between length and total weight, represented by the equation : Pt=2.07 x 10-4 Lt3.01 (r=0.987, p < 0.01). Von Bertalanffy's equations were: for length Lt=45 [1 - e{-1(t+0.06) (05/2 ) sen 2 ((t-065}] and for weight Pt= 26.53 (1- e [-1 (t + 0.06)])3 . The growth rate for total length was 2.25 ±0.66 mm/month for the first year (0.83 ±0.24 the second year and 0.26 ±0.1 for other months). Individuals become sexually mature throughout the year. The mean sex ratio was 1.00 male : 0.61 females. Spawning suggested that minimum size at sexual maturity was 7.80 mm of Lt. The largest number of ripe individuals was found in the dry season. Spawning peaks were in December and March. Histologically this is a dioecious bivalve with stable gonocorism.
Depredación de neonatos de Lepidochelys olivacea (Reptilia: Cheloniidae) por Quiscalus mexicanus (Passeriformes: Icteridae)
Jorge Cabrera Pea
Revista de Biología Tropical , 1998,
Abstract:
El derecho de consumo: Desde la teoria clasica del contrato hasta los nuevos contratos
Cabrera Pea,Karen Isabel;
Revista de Derecho , 2011,
Abstract: this article shows how new economic changes have transformed the traditional contract structure, causing the need to establish new legal guidelines that allow the existence of a contracts law under assumptions of economic equilibrium and legal equality. moreover, it presents an approximation of the current consumer law, the legal developments that have emerged in this topic, and some possible solutions to achieve the goals of free enterprise and private initiative of the parties, when hiring.
El derecho de consumo. Desde la teoría clásica del contrato hasta los nuevos contratos
Karen Isabel Cabrera Pea
Revista de Derecho , 2011,
Abstract: El presente artículo muestra como nuevos cambios en la economía han transformado las estructuras clásicas contractuales, ocasionando la necesidad de constituir nuevas pautas legales que permitan un derecho de contratos bajo premisas de equilibrio económico e igualdad jurídica. De igual forma, presenta una aproximación de la actual situación del derecho de consumo, los avances legales que han surgido al respecto y algunas posibles soluciones para alcanzar los fines de la libertad de empresa y la iniciativa privada, de las partes, al momento de contratar.
Formación de capital humano para su desempe?o en bibliotecas médicas desde 1970 hasta 2008 en Santiago de Cuba
Duperet Cabrera,Elaine; Pea Fernández,Maricela;
MEDISAN , 2009,
Abstract: data related with the formation of middle technician in scientific and technical information and medical library science in santiago de cuba are exposed, for this, the existent records in the secretary of the nursing faculty, old "maximum gómez báez" health polytechnical institute no. 1 were consulted, and the net librarians and those in the provincial information center of medical sciences were interviewed. those of the first three references libraries considered pioneers in this activity were included. also the responsible for the health information management in "juan m. páez inchausti" health technology faculty was contacted to obtain the total number of graduates. since the beginnings of this specialty up to now a vertiginous advance has taken place in several directions, since the information institutions have grown in number in the territory, and the technical personnel performance working in the different health institutions have increased, as well as this has developed the training of the new technologists from one sex or another who form part of the net.
Determinación de nitrógeno amoniacal y total en aguas de consumo y residuales por el método del fenato
Sardi?as Pea,Olivia; Pérez Cabrera,Adisbel;
Revista Cubana de Higiene y Epidemiolog?-a , 2004,
Abstract: the results of the determination of ammoniacal and total nitrogen by the method of phenate in waters were presented aimed at evaluating the quality indicators applied for the validation of assay methods at the laboratory of inorganic chemistry of the national institute of hygiene, epidemiology and microbiology. the precision, bias and uncertainty that were obtained in the lineal range of the calibration graph were evaluated as health indicators. the limit of detection of the method as well as the concentration of ammoniacal and total nitrogen of samples of drinking water and sewage processed by the evaluated method were reported. water samples were processed by the methods indicated in this paper and the normality in the distribution of the results was proved by shapiro wilk's w test.
Biopsia por aspiración con aguja fina en afecciones quirúrgicas del tiroides
Pea Hernández,Elio J; Martínez Cabrera,Jorge;
Revista Cubana de Cirug?-a , 2002,
Abstract: a prospective study was conducted during 3 years to determine the value of fine needle aspiration biopsy (fnab) in the surgical thyropathies at our service. the technique and the criteria of lowhagen were used to carry out the procedure. 402 patients underwent aspiration biopsies and 398 were useful for the diagnosis. 100 of them were operated on. benignity prevailed in 84 % and the follicular adenoma was the most frequent in 59.9 %. cancer was present in 16 % and 68.7 % corresponded to the papillary vairety. women aged 41-50 were more affected. hemithyroidectomy was the most used surgical procedure. the fnab was assessed in the parameters of sensitivity, 93.7 %; specificity, 88 %; positive predictive index, 60 %; negative predictive index, 98.6 %; efficiency, 89 % and false positive fraction, 11.9 %
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